Sighting attachment for guns



July 31, 1928.

R. w. KELM SIGHTING ATTACHMENT FOR GUNS Filed Novr 21, 1927 IN V EN TOR.

' described in any detail as they form no part Patented July 31, 1928.

e as

' SIGHTING ATTACHMENT For; GUNS.

Application filed November 21, 1927. Serial No. 23 13714.

My invention pertains generally to a sight attachment for guns and is particularly adapted for machine guns though not l mited thereto, and has for a primary ob ect the provision of a means for enabling. the operator to sight the gun for a given d1 stance with the same accuracy at night or in the dark as in the day time. v

Another object is to provide a sightlng attachment of the general character described which is simple in construction, easy of operation and which can be readily and effectively used by an unskilled operator.

Other objects and advantages in details of construction and operation will apparent as the descriptionproceeds, reference now being had to the figures of the accompanying drawing wherein like reference numerals 1ndicate'like parts.

In the drawing Figure 1 is a side view of a machine gun equipped with my sighting attachment.

' Figure 2 is a detail perspective view of the attachment.

Figure 3 is a detail cross sectional View taken on the line 33 of Figure 2.

t Figure 4 is a detail perspective view on an enlarged scale of one end of the attachment.

Figure 5 is a. detail front View of the adjustable rear gun sight of the gun, with which my attachment cooperates.

Figure 6 is a detail cross sectional view taken on the line 66 of Figure l.

. The reference numeral 1 refers generally to a machine gun of any desired type provided with a barrel 2, handle 3, anda trigger 4, the gun being adjustably mounted by means of the pivoted bracket 5' upon the tripod or stand 6. r V

The foregoing elements are not shown or p of my invention.

It is well known that in the use of a ma chine gun, the operator desiring or being instructed to adjust his gun to fire a given distance, first pivots the rear sight 7 upwardly to the position shown in Figure 1 and adjusts the slidable member 8 provided with the peep holes 9 and 10 to the proper position with respect to the scales 11 on the sight 7. The slidable member 81s usually provided as shown with a relativelylarge and a relatively small peep hole for difierent conditions of sighting. For instance, if the small peep hole 10, is to be used and the gun is to be adjusted for a thousand yards, the slidable member 8 is raised until the peep hole 10 is opposite the appropriate graduatlon on the scale 11 where it is suitably locked. The operator then sights through the peep hole 10 along-the barrel 2 and over the front sight 12, adjusting the gun carriage on its pivot, for such alignment or sighting. Likewise," if the larger peep hole 9 is to be used, the member 8 is adjusted to br ng the peep hole'9 opposite the desired point on the scale and the front sight 12 brought to alignment with the eye looking through such peep hole 9. This method of s ghting is of course satisfactory in the daytime but is useless at night andunder darkening conditions when it is impossible to accurately line up the front sight 12 through the peep holes. In order therefore to make it possible to accurately sight the gun at night, have provided a sighting device 13 consisting of a relatively narrow fiat strip in two sections, the adjoining ends of which are clove-tailed together as at 14 to permit longitudinal adjustment of the sections. The front end of the device is provided with a slot 15 adapted to fit over the front sight 12 on the barrel 2 and the rear end of which is provided with a tapered point 16 adapted to engage in either of the peep holes 9 or 10. It will be understood of course that theraising ofthe slidable member 8 on the sight 7 will make it-necessary to slightly lengthen the member nection 14; of its sections in order to accommodate the point 16 within the peep hole.

Mounted slightly ahead of the point 16, I have'provided the member 13 with a level 17 constructed in accordance with the well known type of level provided with a glass tube 17' filled with a liquid 17 and having an air bubble 18 for indicating when the 13 by'means of the dove-tail consame is positioned horizontally level. The.

' light in position and also supplies the light guardfld for the level,

to protect it against enemy'eyes at night;

' In the operation of ner first adjuststhe sliding member 8 on the rear si ht member 7 to the proper position 7 With respect to the scale 11,hooks the front end of the sighting member 13 over thefront sight 12 and places the point 16 at the opposite end inthe peep hole 9 or 10 which for any given distance, Whether at night or? in the daytime and by the use of the sighting device 13 adjust his'gun for firing at such distance; I I r e V It: will be understood of course that changes may bem'adeiin details oi construction and arrangement of parts, Without demy invention, the gunv to the exact form herein shown and do scribed other than by the appended claims.

I claim I 1. Ill-COmblDfLhlOll with the front sight and a vertically adjustable rear sight of a gun,

a sighting attachment extending between such sightsand attachablethereto for adjustment with said rear sight, and a level for indicating the horizontal position ofsaidatand a vertically adjustable rear sight of a gun, an extensiblesighting attachment extending between sa d sightsand attachable thereto for adjustment Withsaid rear sight and a level for indicating the horizontal po- 7 sition of said attachment. 7 v

3. sightingattachment for guns comprising a longitudinally extensible member provided at one endavitlii a lot-to receive a front sight of a gun and at the opposite end With a t-ai ier'ed point for engaging with a rear sight, and a le el on saidat tachment for indicating the horizontal positionof said RIIoHAR enna.

parting from the spiritandscope' of my in' attachment. vention. 'I' do not limit myself therefore 

